Texas Instruments MSP430F5151IRSBT

Overview

MSP430F5151IRSBT from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller featuring 16 KB Flash, 2 KB RAM, dual 16-bit Timer_D modules (TD0/TD1), USCI_A0 (UART/IrDA/SPI) and USCI_B0 (I²C/SPI), 16-channel comparator, and 5-V-tolerant I/Os in a 40-pin QFN package. It operates from 1.8 V to 3.6 V and supports wake-up from LPM3 in <5 µs - ideal for battery-powered sensor nodes and LED lighting control.

For engineers reviewing the MSP430F5151IRSBT datasheet, MSP430F5151IRSBT pinout, MSP430F5151IRSBT application, or MSP430F5151IRSBT equivalent, key selection criteria include its 16 KB Flash/2 KB RAM configuration, absence of integrated ADC (unlike F51x2 variants), 31 GPIOs with programmable drive strength, and compatibility with TI's MSP430F51x1 family toolchain and firmware libraries.

Technical Context

The MSP430F5151IRSBT belongs to the MSP430F51x1 subfamily and shares the CPUXV2 core, unified clock system (FLL + VLO + REFO + XT1), and flexible port mapping controller with other F51x1 devices. It omits the 10-bit ADC10_A module present in F51x2 parts (e.g., MSP430F5152), confirming its role as a cost-optimized variant for digital-control-dominant applications.

Its peripheral set includes two 16-bit Timer_D modules supporting high-resolution PWM and capture, three-channel DMA, hardware multiplier (MPY32), and dual USCI interfaces - enabling simultaneous UART-based host communication and I²C sensor interfacing without CPU overhead.

Key Specifications

Pinout & Package

Package: 40-pin WQFN (RSB), 5 mm × 5 mm, 0.4 mm pitch, exposed thermal pad. Pinout validated per TI SLAS619R Figure 4-1 and Table 4-1 for RSB package.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power microcontroller applications.

Compared with MSP430F5131IRSBT, the MSP430F5151IRSBT provides double the Flash and RAM for complex state machines or protocol stacks; compared with MSP430F5152IRSBT, it trades ADC capability for lower cost and reduced analog design complexity where only digital I/O and timers are needed.

Availability

MSP430F5151IRSBT is available at Aetrix Electronics and suitable for smart lighting control, industrial sensor nodes, remote-control receivers, and digital power supply monitors requiring stable component supply and long-term production continuity.

Supply support for MSP430F5151IRSBT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on energy efficiency and reliability.

The MSP430F51x1 product line targets ultra-low-power embedded control applications - optimized for extended battery life in portable measurement, sensing, and timing-critical systems using five low-power modes and fast wake-up.

FAQ

What is the maximum operating frequency of the MSP430F5151IRSBT?

The MSP430F5151IRSBT supports a maximum system clock (MCLK) of 25 MHz when using the high-frequency XT1 crystal oscillator. Its digitally controlled oscillator (DCO) is FLL-stabilized and configurable across multiple ranges, with typical operation up to 25 MHz under recommended conditions. The instruction cycle time is 40 ns at 25 MHz, enabling deterministic real-time control loops. MSP430F5151IRSBT achieves this while maintaining ultra-low active current of 180 µA/MHz.

Does the MSP430F5151IRSBT include an analog-to-digital converter (ADC)?

No, the MSP430F5151IRSBT does not include an integrated ADC. It belongs to the MSP430F51x1 subfamily, which excludes the ADC10_A module found in the F51x2 variants (e.g., MSP430F5152). This omission reduces cost and power consumption in applications relying solely on digital I/O, timers, and communication peripherals. For analog sensing, external ADCs or comparator-based threshold detection must be used. MSP430F5151IRSBT retains the 16-channel Comparator_B module for fast, low-power analog event detection.

What debug interface does the MSP430F5151IRSBT support?

The MSP430F5151IRSBT supports Spy-Bi-Wire (SBW), a 2-wire variant of JTAG, using pins RST/NMI/SBWTDIO and TEST/SBWTCK. This enables full in-circuit debugging, flash programming, and real-time variable inspection with minimal PCB footprint. No external voltage is required for programming - serial onboard programming (SBW) operates directly from the DVCC supply. TI's MSP-FET and compatible IDEs (e.g., Code Composer Studio) fully support MSP430F5151IRSBT via SBW without additional hardware.

Is the MSP430F5151IRSBT pin-compatible with other packages in the F51x1 family?

Yes, the MSP430F5151IRSBT in the 40-pin RSB (WQFN) package shares identical pin functions and signal mapping with the MSP430F5151IDA (38-pin TSSOP) and MSP430F5151IYFF (40-pin DSBGA) variants. All three packages implement the same 31 GPIOs, power, clock, and debug signals - enabling direct PCB footprint interchangeability where mechanical constraints allow. However, the TSSOP offers fewer GPIOs (29) due to reduced pin count, and the DSBGA requires microvia routing. MSP430F5151IRSBT is the preferred choice for space-constrained, thermally demanding layouts.

How does the port mapping controller enhance design flexibility for the MSP430F5151IRSBT?

The port mapping controller in the MSP430F5151IRSBT allows runtime reassignment of peripheral functions (e.g., USCI_A0 TXD, TD0.0, CB0) to any GPIO pin within designated port groups - decoupling hardware layout from firmware peripheral allocation. This eliminates fixed-function pin conflicts, enables single PCB designs to support multiple firmware variants, and simplifies redesigns when signal routing is constrained. MSP430F5151IRSBT uses the PMAP module to configure mappings via dedicated registers, with no performance penalty or additional clock cycles required for function switching.